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gecko-dev/gfx/cairo/win32-printing-axis-swap.patch

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# HG changeset patch
# User Lee Salzman <lsalzman@mozilla.com>
# Date 1445463645 14400
# Wed Oct 21 17:40:45 2015 -0400
# Node ID 9e84563cbd73c5b0993dfd018ca25b660b667e94
# Parent 2d3fd51c4182c253a2f102655e8e9e466032853f
workaround for Windows printer drivers that can't handle swapped X and Y axes
diff --git a/gfx/cairo/cairo/src/cairo-matrix.c b/gfx/cairo/cairo/src/cairo-matrix.c
--- a/gfx/cairo/cairo/src/cairo-matrix.c
+++ b/gfx/cairo/cairo/src/cairo-matrix.c
@@ -873,42 +873,56 @@ cairo_bool_t
(Note that the minor axis length is at the minimum of the above solution,
which is just sqrt ( f - sqrt(g² + h²) ) given the symmetry of (D)).
For another derivation of the same result, using Singular Value Decomposition,
see doc/tutorial/src/singular.c.
*/
-/* determine the length of the major axis of a circle of the given radius
- after applying the transformation matrix. */
-double
-_cairo_matrix_transformed_circle_major_axis (const cairo_matrix_t *matrix,
- double radius)
+/* determine the length of the major and minor axes of a circle of the given
+ radius after applying the transformation matrix. */
+void
+_cairo_matrix_transformed_circle_axes (const cairo_matrix_t *matrix,
+ double radius,
+ double *major,
+ double *minor)
{
- double a, b, c, d, f, g, h, i, j;
+ double a, b, c, d, f, g, h, i, j, k;
_cairo_matrix_get_affine (matrix,
&a, &b,
&c, &d,
NULL, NULL);
i = a*a + b*b;
j = c*c + d*d;
+ k = a*c + b*d;
f = 0.5 * (i + j);
g = 0.5 * (i - j);
- h = a*c + b*d;
+ h = hypot (g, k);
- return radius * sqrt (f + hypot (g, h));
+ if (major)
+ *major = radius * sqrt (f + h);
+ if (minor)
+ *minor = radius * sqrt (f - h);
+}
- /*
- * we don't need the minor axis length, which is
- * double min = radius * sqrt (f - sqrt (g*g+h*h));
- */
+/* determine the length of the major axis of a circle of the given radius
+ after applying the transformation matrix. */
+double
+_cairo_matrix_transformed_circle_major_axis (const cairo_matrix_t *matrix,
+ double radius)
+{
+ double major;
+
+ _cairo_matrix_transformed_circle_axes (matrix, radius, &major, NULL);
+
+ return major;
}
void
_cairo_matrix_to_pixman_matrix (const cairo_matrix_t *matrix,
pixman_transform_t *pixman_transform,
double xc,
double yc)
{
diff --git a/gfx/cairo/cairo/src/cairo-win32-printing-surface.c b/gfx/cairo/cairo/src/cairo-win32-printing-surface.c
--- a/gfx/cairo/cairo/src/cairo-win32-printing-surface.c
+++ b/gfx/cairo/cairo/src/cairo-win32-printing-surface.c
@@ -610,16 +610,17 @@ static cairo_status_t
int x_tile, y_tile, left, right, top, bottom;
RECT clip;
const cairo_color_t *background_color;
const unsigned char *mime_data;
unsigned long mime_size;
cairo_image_info_t mime_info;
cairo_bool_t use_mime;
DWORD mime_type;
+ cairo_bool_t axis_swap;
/* If we can't use StretchDIBits with this surface, we can't do anything
* here.
*/
if (!(surface->flags & CAIRO_WIN32_SURFACE_CAN_STRETCHDIB))
return CAIRO_INT_STATUS_UNSUPPORTED;
if (surface->content == CAIRO_CONTENT_COLOR_ALPHA)
@@ -658,39 +659,65 @@ static cairo_status_t
&mime_size,
&mime_info);
}
if (_cairo_status_is_error (status))
return status;
use_mime = (status == CAIRO_STATUS_SUCCESS);
- if (!use_mime && image->format != CAIRO_FORMAT_RGB24) {
+ m = pattern->base.matrix;
+ status = cairo_matrix_invert (&m);
+ /* _cairo_pattern_set_matrix guarantees invertibility */
+ assert (status == CAIRO_STATUS_SUCCESS);
+ cairo_matrix_multiply (&m, &m, &surface->ctm);
+ cairo_matrix_multiply (&m, &m, &surface->gdi_ctm);
+ /* Check if the matrix swaps the X and Y axes by checking if the diagonal
+ * is effectively zero. This can happen, for example, if it was composed
+ * with a rotation such as a landscape transform. Some printing devices
+ * don't support such transforms in StretchDIBits.
+ */
+ axis_swap = fabs (m.xx*image->width) < 1 && fabs (m.yy*image->height) < 1;
+
+ if (!use_mime && (image->format != CAIRO_FORMAT_RGB24 || axis_swap)) {
cairo_surface_t *opaque_surface;
cairo_surface_pattern_t image_pattern;
cairo_solid_pattern_t background_pattern;
+ int width = image->width, height = image->height;
+ if (axis_swap) {
+ width = image->height;
+ height = image->width;
+ }
opaque_surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24,
- image->width,
- image->height);
+ width,
+ height);
if (opaque_surface->status) {
status = opaque_surface->status;
goto CLEANUP_OPAQUE_IMAGE;
}
- _cairo_pattern_init_solid (&background_pattern,
- background_color);
- status = _cairo_surface_paint (opaque_surface,
- CAIRO_OPERATOR_SOURCE,
- &background_pattern.base,
- NULL);
- if (status)
- goto CLEANUP_OPAQUE_IMAGE;
+ if (image->format != CAIRO_FORMAT_RGB24) {
+ _cairo_pattern_init_solid (&background_pattern,
+ background_color);
+ status = _cairo_surface_paint (opaque_surface,
+ CAIRO_OPERATOR_SOURCE,
+ &background_pattern.base,
+ NULL);
+ if (status)
+ goto CLEANUP_OPAQUE_IMAGE;
+ }
_cairo_pattern_init_for_surface (&image_pattern, &image->base);
+ if (axis_swap) {
+ /* swap the X and Y axes to undo the axis swap in the matrix */
+ cairo_matrix_t swap_xy = { 0, 1, 1, 0, 0, 0 };
+ cairo_pattern_set_matrix (&image_pattern.base, &swap_xy);
+ cairo_matrix_multiply (&m, &swap_xy, &m);
+ }
status = _cairo_surface_paint (opaque_surface,
CAIRO_OPERATOR_OVER,
&image_pattern.base,
NULL);
_cairo_pattern_fini (&image_pattern.base);
if (status)
goto CLEANUP_OPAQUE_IMAGE;
@@ -706,23 +733,16 @@ static cairo_status_t
bi.bmiHeader.biXPelsPerMeter = PELS_72DPI;
bi.bmiHeader.biYPelsPerMeter = PELS_72DPI;
bi.bmiHeader.biPlanes = 1;
bi.bmiHeader.biBitCount = 32;
bi.bmiHeader.biCompression = use_mime ? mime_type : BI_RGB;
bi.bmiHeader.biClrUsed = 0;
bi.bmiHeader.biClrImportant = 0;
- m = pattern->base.matrix;
- status = cairo_matrix_invert (&m);
- /* _cairo_pattern_set_matrix guarantees invertibility */
- assert (status == CAIRO_STATUS_SUCCESS);
-
- cairo_matrix_multiply (&m, &m, &surface->gdi_ctm);
- cairo_matrix_multiply(&m, &m, &surface->ctm);
SaveDC (surface->dc);
_cairo_matrix_to_win32_xform (&m, &xform);
if (! SetWorldTransform (surface->dc, &xform)) {
status = _cairo_win32_print_gdi_error ("_cairo_win32_printing_surface_paint_image_pattern");
goto CLEANUP_OPAQUE_IMAGE;
}
@@ -1260,16 +1280,17 @@ static cairo_int_status_t
DWORD pen_width;
DWORD *dash_array;
HGDIOBJ obj;
unsigned int i;
cairo_solid_pattern_t clear;
cairo_matrix_t mat;
double scale;
double scaled_width;
+ double major, minor;
status = _cairo_surface_clipper_set_clip (&surface->clipper, clip);
if (status)
return status;
if (op == CAIRO_OPERATOR_CLEAR) {
_cairo_win32_printing_surface_init_clear_color (surface, &clear);
source = (cairo_pattern_t*) &clear;
@@ -1350,22 +1371,40 @@ static cairo_int_status_t
if (status)
return status;
/*
* Switch to user space to set line parameters
*/
SaveDC (surface->dc);
- _cairo_matrix_to_win32_xform (&mat, &xform);
- xform.eDx = 0.0f;
- xform.eDy = 0.0f;
+ /* Some printers don't handle transformed strokes. Avoid the transform
+ * if not required for the pen shape. Use the SVD here to find the major
+ * and minor scales then check if they differ by more than 1 device unit.
+ * If the difference is smaller, then just treat the scaling as uniform.
+ * This check ignores rotations as the pen shape is symmetric before
+ * transformation.
+ */
+ _cairo_matrix_transformed_circle_axes (&mat, scale, &major, &minor);
+ if (fabs (major - minor) > 1) {
+ /* Check if the matrix swaps the X and Y axes such that the diagonal
+ * is nearly zero. This was observed to cause problems with XPS export.
+ */
+ if (fabs (mat.xx) < 1e-6 && fabs (mat.yy) < 1e-6) {
+ /* swap the X and Y axes to undo the axis swap in the matrix */
+ cairo_matrix_t swap_xy = { 0, 1, 1, 0, 0, 0 };
+ cairo_matrix_multiply (&mat, &swap_xy, &mat);
+ }
+ _cairo_matrix_to_win32_xform (&mat, &xform);
+ xform.eDx = 0.0f;
+ xform.eDy = 0.0f;
- if (!ModifyWorldTransform (surface->dc, &xform, MWT_LEFTMULTIPLY))
- return _cairo_win32_print_gdi_error ("_win32_surface_stroke:SetWorldTransform");
+ if (!ModifyWorldTransform (surface->dc, &xform, MWT_LEFTMULTIPLY))
+ return _cairo_win32_print_gdi_error ("_win32_surface_stroke:SetWorldTransform");
+ }
if (source->type == CAIRO_PATTERN_TYPE_SOLID) {
StrokePath (surface->dc);
} else {
if (!WidenPath (surface->dc))
return _cairo_win32_print_gdi_error ("_win32_surface_stroke:WidenPath");
if (!SelectClipPath (surface->dc, RGN_AND))
return _cairo_win32_print_gdi_error ("_win32_surface_stroke:SelectClipPath");
diff --git a/gfx/cairo/cairo/src/cairoint.h b/gfx/cairo/cairo/src/cairoint.h
--- a/gfx/cairo/cairo/src/cairoint.h
+++ b/gfx/cairo/cairo/src/cairoint.h
@@ -2115,16 +2115,22 @@ cairo_private cairo_bool_t
int *itx, int *ity);
cairo_private cairo_bool_t
_cairo_matrix_has_unity_scale (const cairo_matrix_t *matrix);
cairo_private cairo_bool_t
_cairo_matrix_is_pixel_exact (const cairo_matrix_t *matrix) cairo_pure;
+cairo_private void
+_cairo_matrix_transformed_circle_axes (const cairo_matrix_t *matrix,
+ double radius,
+ double *major,
+ double *minor);
+
cairo_private double
_cairo_matrix_transformed_circle_major_axis (const cairo_matrix_t *matrix,
double radius) cairo_pure;
cairo_private void
_cairo_matrix_to_pixman_matrix (const cairo_matrix_t *matrix,
pixman_transform_t *pixman_transform,
double xc,
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